The US government is hoping to develop scanning systems that can pick out would-be terrorists that are about to enter the US. But the sensors won't be looking for hidden explosives or knives, they will be trained at recognizing human emotions, to detect if someone is hiding an intention to deceive or harm. The US Department of Homeland Security plans to test "Project Hostile Intent" at a handful of US airports, borders and ports as early as 2010.
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